<style>
    #side-nav{
        height:700px;overflow:auto;
    }
    #side-nav::-webkit-scrollbar{display: none}
</style>
<!-- 左侧菜单开始 -->
<div class="left-nav">
    <div id="side-nav">

        <ul id="nav">
            {!! $arr_menu_list !!}
        </ul>
    </div>
</div>
<!-- <div class="x-slide_left"></div> -->
<!-- 左侧菜单结束 -->